On Mon, Oct 11, 2010 at 08:25:24AM +0200, Knacktus wrote:
>
> Am 11.10.2010 06:24, schrieb Denis Gomes:
> >Hi Everyone,
> >
> > I have a basic python question. I am writing an n dimensional vector
> >class by inheriting from the builtin python list object. I want to be
> >able to hide the parent object's methods in the derived class instances.
> Why inheriting then?
> Another approach to reusing exisiting methods is to wrap them into your
> newly defined methods. Here you would not inherit from a list, but
> create a list in your class (composition). E.g.
>
> class MyVector(object):
>
> def __init__(self):
> self.data = []
>
> def append_data(self, new_data):
> self.data.append(new_data)
>
> Actually I use this all the time. And I used this before I knew about
> inheritance.
It's a good technique. And, it's called delegation. For more on
delegation, see this:
http://en.wikipedia.org/wiki/Delegation_(programming)
Also see Alan's message in this same thread.
- Dave
--
Dave Kuhlman
http://www.rexx.com/~dkuhlman
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